Leighton Stone, Earl of Longbridge, is used to danger. His years as a code breaker in Wellington's army have been filled with it. All he wants, at the end of the Peninsular War, is to return to his estate and marry his childhood sweetheart, Maddie Westlake. Maddie, not a typical parson's daughter, is tired of outwitting her parsimonious father to take care of Leighton's tenants and tired of being taken for granted. When her father sends her away, Leighton tracks her to Bath and discovers he must woo Maddie to win her love. Conniving relatives try to keep them apart, but music and memories pull this pair together as they are drawn into a bizarre spy plot only Maddie can solve.